/* 重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #fff;
    color: #24292e;
    line-height: 1.6;
    margin: 0;
  }
  
  /* 新增 wrapper 容器 */
  .wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }
  
  /* 通用容器 */
  .container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
  }
  
  /* 头部区域 */
  .business-header {
    background-color: #fff;
    border-bottom: 1px solid #e1e4e8;
    padding: 15px 0;
  }
  
  .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .business-logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: #24292e;
  }
  
  /* 认证按钮样式 */
  .auth-buttons a {
    text-decoration: none;
    font-size: 0.875rem;
    padding: 6px 12px;
    border-radius: 6px;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    margin-left: 10px;
    border: 1px solid transparent;
  }
  
  .business-btn.login-btn {
    color: #24292e;
    border-color: #d1d5da;
  }
  
  .business-btn.login-btn:hover {
    background-color: #f6f8fa;
  }
  
  .business-btn.primary-btn {
    background-color: #2ea44f;
    border-color: rgba(27, 31, 35, 0.15);
    color: #fff;
  }
  
  .business-btn.primary-btn:hover {
    background-color: #2c974b;
  }
  
  /* 主体部分 */
  .business-main {
    flex: 1;  /* 自动占满剩余空间 */
    display: flex;
    flex-direction: column;
    justify-content: center; /* 垂直居中 */
    padding: 0 0 40px; /* 如有需要可以保留左右或下边距 */
  }
  
  /* 以下为示例，其余部分保持原有 GitHub 风格样式 */
  
  /* 通用容器 */
  .container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
  }
  
  /* 头部区域 */
  .business-header {
    background-color: #fff;
    border-bottom: 1px solid #e1e4e8;
    padding: 15px 0;
  }
  
  .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .business-logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: #24292e;
  }
  
  /* 认证按钮样式 */
  .auth-buttons a {
    text-decoration: none;
    font-size: 0.875rem;
    padding: 6px 12px;
    border-radius: 6px;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    margin-left: 10px;
    border: 1px solid transparent;
  }
  
  .business-btn.login-btn {
    color: #24292e;
    border-color: #d1d5da;
  }
  
  .business-btn.login-btn:hover {
    background-color: #f6f8fa;
  }
  
  .business-btn.primary-btn {
    background-color: #2ea44f;
    border-color: rgba(27, 31, 35, 0.15);
    color: #fff;
  }
  
  .business-btn.primary-btn:hover {
    background-color: #2c974b;
  }
  
  /* Features 区域 */
  .features-section {
    padding: 40px 0;
  }
  
  .section-title {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 30px;
    color: #24292e;
  }
  
  /* Features 网格布局 */
  .features-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 20px;
  }
  
  .feature-card {
    flex: 1 1 calc(33.333% - 20px);
    background-color: #fff;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    padding: 20px;
    text-align: center;
    transition: box-shadow 0.2s ease;
  }
  
  .feature-card:hover {
    box-shadow: 0 4px 12px rgba(27, 31, 35, 0.15);
  }
  
  .feature-icon {
    font-size: 2rem;
    color: #586069;
    margin-bottom: 10px;
  }
  
  .feature-card h4 {
    font-size: 1.125rem;
    margin-bottom: 10px;
    color: #24292e;
  }
  
  .feature-card p {
    font-size: 0.95rem;
    color: #586069;
  }
  
  /* 底部区域 */
  .business-footer {
    background-color: #f6f8fa;
    border-top: 1px solid #e1e4e8;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
  }
  
  .business-footer p {
    font-size: 0.875rem;
    color: #586069;
  }
  
  /* 响应式处理 */
  @media (max-width: 768px) {
    .header-content {
      flex-direction: column;
      align-items: flex-start;
    }
    .auth-buttons {
      margin-top: 10px;
    }
    .features-grid {
      flex-direction: column;
    }
    .feature-card {
      flex: 1 1 100%;
    }
  }
  